Language dead or alive?

Here's your first task : 
You are expected to 
search
and read 
and find
and read some more
then select
and read even more
and then write about 
and describe 
in your own words
a 'lost' language: one that has died and been lost to human civilisation forever. 
You could however also choose to speak about the findings of a "new" language : one that has recently been 'discovered'. 
Happy searching !!